Teams are allowed 30 national visitors leading up to the draft. They do not work out, but they meet with coaches and scouts and are put to the test mentally. The Cowboys can have an unlimited number of players work out at their Dallas day session on April 17 that includes players from local colleges or who played high school football in the area.

Donald has been linked to the Cowboys since an impressive showing at the Senior Bowl in January. He met with coaches at the NFL scouting combine in Indianapolis in February and will come to Valley Ranch as well. Donald might be the perfect fit as a 3-technique in Rod Marinelli’s defense.

The Cowboys signed Henry Melton as a free agent, but it does not take them out of the bidding for Donald, who had 11 sacks and 28.5 tackles last season. Melton’s contract is essentially a one-year deal. If he does not perform at a high level, the Cowboys can walk away from the final three years of the contract by not exercising the option.

Barr had 23.5 sacks in his last two years at UCLA and was a first-team All-Pac-12 pick. He played mostly linebacker, but his ability to rush the passer has some teams wondering if he can be a full-time defensive end. It is possible he could play strongside linebacker and move to defensive end in passing situations.

Shazier has phenomenal athleticism and can cover tight ends and running backs. With Bruce Carter in the final year of his deal, Shazier could provide excellent insurance or perhaps force Carter to move to the strongside linebacker spot. Shazier had 143 tackles last year for Ohio State and 44.5 tackles for loss in his career.

Lawrence led the Mountain West with 10.5 sacks in 2013 and had 20.5 tackles for loss. At 6-foot-3, 251 pounds, he is more of a defensive end than outside linebacker with long arms and deceptive strength.

Ward is one of the top safeties in the draft and could be a first-round pick. He had 95 tackles, seven interceptions and 10 pass deflections last season, but he is also coming off foot surgery. The Cowboys have not looked at the veteran safety market in free agency for somebody to play alongside Barry Church. They have said they like what they have in last year’s third-rounder, J.J. Wilcox, as well as Jeff Heath and Matt Johnson, who has yet to play in his first two years because of injuries.